As an aside here, I would be cautious of attributing declining growth on Facebook to pretty much anything. They are the first company in the history of our spec

As an aside here, I would be cautious of attributing declining growth on Facebook to pretty much anything. They are the first company in the history of our species to take market saturation to such extremes. They have more than 2 billion active monthly users, and growing. The issue they have is that there are only 3-4 billion internet users in the entire world. Their growth is predictably going to hit an asymptote at some point in the near future - they are simply running out of people. That also poses an interesting issue from a company perspective. We still live in a world where endless growth is expected. But with a ad-driven service the only way to make more money is to get users to view/click and otherwise interact with even more ads, or to otherwise increase the efficiency of ads. And that in general achieves little other creating a worse user experience, no matter how clever the packaging and delivery.